Back to EveryPatent.com
| United States Patent |
5,285,684
|
|
Uesugi
, et al.
|
February 15, 1994
|
Shape detecting roll
Abstract
The present invention relates to a shape detecting roll rotatable for
supporting a traveling rolled material over the width thereof to detect
the pressure of the rolled material from portion to portion widthwise
thereof and detect the shape of the rolled material by processing the
detected pressure by calculation. The roll comprises a plurality of disks
(2) arranged axially of the roll concentrically with one another and each
having a pressure sensor (1) incorporated in its peripheral portion, a
clearance (11) being formed between the side surfaces of peripheral
portions of the adjacent disks (2) for preventing the interference between
the peripheral portions. The side surfaces of the disk peripheral portions
(10) forming the clearance (11) are activated by a reverse electrolytic
treatment and thereafter coated with a corrosion-resistant plating. The
plating film firmly adheres to the surfaces of the disks, protecting the
side surfaces of the disk peripheral portions against corrosion and
assuring the roll of high detection accuracy for a prolonged period of
time.
| Inventors:
|
Uesugi; Kenichi (Kobe, JP);
Sasaki; Toshiyuki (Kakogawa, JP)
|
| Assignee:
|
Kabushiki Kaisha Kobe Seiko Sho (Kobe, JP)
|
| Appl. No.:
|
667396 |
| Filed:
|
March 28, 1991 |
| PCT Filed:
|
July 27, 1990
|
| PCT NO:
|
PCT/JP90/00959
|
| 371 Date:
|
March 28, 1991
|
| 102(e) Date:
|
March 28, 1991
|
| PCT PUB.NO.:
|
WO91/02231 |
| PCT PUB. Date:
|
February 21, 1991 |
Foreign Application Priority Data
| Current U.S. Class: |
73/159; 33/501.03 |
| Intern'l Class: |
G01L 005/00 |
| Field of Search: |
33/501.02,501.03,561.1,711
73/159
|
References Cited
U.S. Patent Documents
| 3890209 | Jun., 1975 | Shigeta et al. | 204/129.
|
| 3902363 | Sep., 1975 | Ishimoto.
| |
| 4439303 | Mar., 1984 | Cocchi | 204/434.
|
| 4542077 | Sep., 1985 | Ogata et al. | 428/629.
|
| 4729729 | Mar., 1988 | Tarumoto et al. | 428/666.
|
| Foreign Patent Documents |
| 2310552 | Sep., 1973 | DE.
| |
| 49-24464 | Mar., 1974 | JP.
| |
| 56-82424 | Jul., 1981 | JP.
| |
| 317699 | Dec., 1988 | JP.
| |
Primary Examiner: Will; Thomas B.
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
Claims
We claim:
1. A shape detecting roll rotatable for supporting a traveling rolled
material over the width thereof to detect the pressure of the rolled
material from portion to portion widthwise thereof and detect the shape of
the rolled material by processing the detected pressure by calculation,
the roll comprising a plurality of disks arranged axially of the roll
concentrically with one another and each having a pressure sensor
incorporated in its peripheral portion, a clearance being formed between
the side surfaces of peripheral portions of the adjacent disks for
preventing the interference between the peripheral portions, the
improvement comprising at least the side surfaces of the disk peripheral
portions forming the clearance are activated by a reverse electrolytic
treatment and thereafter coated with a corrosion-resistant plating.
2. A shape detecting roll as defined in claim 1 wherein the disks are made
of chromium-molybdenum-steel material.
3. A shape detecting roll as defined in claim 1 wherein the disks are made
of an abrasion-resistant steel material containing one or at least two of
Cr, Si, Mo, V, Nb, Cu, Ni, W, Co, Ti, Zr, etc. in a total amount of at
least 7 wt. % as reinforcing or hardening alloy elements.
4. A shape detecting roll as defined in claim 1 wherein the reverse
electrolytic treatment is conducted with a bath of chromic acid and
sulfuric acid in mixture.
5. A shape detecting roll as defined in claim 1 or 4 wherein the
corrosion-resistant plating is an nickel-phosphorus plating.
6. The shape detecting roll of claim 1, wherein outer surfaces of the disk
peripheral portions are activated by the reverse electrolytic treatment
and thereafter coated with the corrosion-resistant plating.
7. A method for forming a shape detecting roll which is rotatable for
supporting a traveling rolled material over the width thereof to detect
the pressure of the rolled material from portion to portion widthwise
thereof and detect the shape of the rolled material by processing the
detected pressure by calculation, the roll comprising a plurality of disks
arranged axially of the roll concentrically with one another and each
having a pressure sensor incorporated in its peripheral portion, a
clearance being formed between side surfaces of peripheral portions of the
adjacent disks for preventing the interference between the peripheral
portions, the method comprising:
activating the side surfaces of the disk peripheral portions forming the
clearance by a reverse electrolytic treatment; and
thereafter forming a corrosion-resistant plating upon said activated side
surfaces.
8. The method of claim 7, wherein said plating step includes forming a
nickel-phosphorus plating.
Description
TECHNICAL FIELD
The present invention relates to a roll for detecting the elongation
(shape) of rolled materials from portion to portion widthwise thereof.
BACKGROUND ART
A method is known of detecting the shape of traveling rolled materials
(mainly rolled strip) widthwise thereof by detecting the pressure of the
rolled material from portion to portion widthwise thereof with a rotating
roll supporting the rolled material over the width thereof and determining
the tension and therefore the elongation of the widthwise portions from
the pressure.
Such shape detecting rolls are disclosed in Unexamined Japanese Patent
Publication SHO 56-82424, etc. An example of such roll will be described
with reference to FIGS. 1 to 3.
The illustrated roll comprises a plurality of disks 2 held between a pair
of stationary plates 3 on opposite sides and each having a pressure sensor
1 incorporated therein close to its periphery. The disks 1 are arranged
axially of the roll concentrically with one another and joined together by
tie rods 4. An end member 6 having a projecting roll shaft 5 is fixed to
each end of the disk assembly concentrically therewith. The roll shaft 5
is rotatably supported by a bearing.
Each disk 2 has an annular portion 8 positioned inwardly of its peripheral
portion and provided on opposite sides thereof with faces 9 for contact
with the respective disks adjacent thereto. The pressure sensor 1 is
accommodated between the disk peripheral portion 10 and the periphery of
the annular portion 8. To assure the pressure sensor 1 of accurate
detection, a clearance 11 of about 0.1 mm is provided between the
peripheral portions 10 of the adjacent disks for preventing the
interference between the peripheral portions 10. A seal groove 12 is
formed in each side surface of the peripheral portion 10, and a seal ring
13 is fitted in the seal groove 12 for preventing a coolant or the like
from penetrating into the sensor accommodating chamber 14 through the
clearance 11. Indicated at 15 in FIG. 3 are holes for reducing GD.sup.2.
Conventionally, the disks 2 are made of SCM material. The disks 2 are
plated to obviate the likelihood that the side surfaces of the disk
peripheral portions 10 will be corroded to close the clearance 11 if the
roll is installed in a line wherein a rolling oil (soluble oil) containing
a large amount of water is used or in a seaside area where the roll is
exposed to the air containing salt. Thus, the side surfaces of the
peripheral portions 10 defining each clearance 11 are coated with a
corrosion-resistant plating film.
With the rolling conditions becoming severer in recent years, the pressure
detecting roll has been placed into frequent use. To meet the need to give
improved abrasion resistance to the roll, steel materials containing large
quantities of special components, such as V and Nb, are used for making
the disks.
However, if the disk is made of the steel material which permits presence
of tough oxides or compounds of special elements, the disk surface can not
be fully activated merely by acid pickling or degreasing which is usually
conducted as a pretreatment before plating, with the result that the
plating is very poor in adhesion and fails to serve for a long period of
time.
An object of the present invention, which has been accomplished in view of
the above problem, is to provide a shape detecting roll comprising disks
which are coated with a corrosion-resistant plating over the side surfaces
of the peripheral portions thereof forming a clearance between the
adjacent disks, the plating being resistant to peeling regardless of the
material used for the disks so as to give high durability to the roll.
DISCLOSURE OF THE INVENTION
To fulfill the above object, the present invention provides the following
technical means.
More specifically, the invention provides a shape detecting roll rotatable
for supporting a traveling rolled material over the width thereof to
detect the pressure of the rolled material from portion to portion
widthwise thereof, the roll comprising a plurality of disks 2 arranged
axially of the roll concentrically with one another and each having a
pressure sensor 1 incorporated in its peripheral portion, a clearance 11
being formed between the side surfaces of peripheral portions of the
adjacent disks 2 for preventing the interference between the peripheral
portions, the roll being characterized in that the side surfaces of the
disk peripheral portions 10 forming the clearance 11 are activated by a
reverse electrolytic treatment and thereafter coated with a
corrosion-resistant plating.
The disks are made of SCM material, or an abrasion-resistant steel material
containing one or at least two of Cr, Si, Mo, V, Nb, Cu, Ni, W, Co, Ti,
Zr, etc. in a total amount of at least 7 wt. % as reinforcing or hardening
alloy components.
The reverse electrolytic treatment is conducted with use of a bath of
chromic acid and sulfuric acid in mixture, and electroless Ni-P plating is
conducted for forming the corrosion-resistant plating.
With the shape detecting roll of the present invention, the side surfaces
of the disk peripheral portions for forming a clearance for ensuring
accurate detection are subjected to the reverse electrolytic treatment
before the side surfaces are coated with a corrosion-resistant plating, so
that even if tough oxides or compounds which are not decomposed by acid
pickling are formed on the disk surfaces, these compounds are readily
removed on decomposition for the activation of the surfaces. The activated
surfaces are thereafter coated with the corrosion-resistant plating, which
can therefore be firmly adhered to the disk surfaces. Consequently, even
if a soluble oil or the like penetrates into the clearance, the side
surfaces of the disk peripheral portions remain free of corrosion over a
long period of time to prevent closing of the clearance, assuring the roll
of very accurate detection over a prolonged period of time.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary view in section showing the construction of a shape
detecting roll embodying the present invention;
FIG. 2 is a fragmentary enlarged view of the peripheral portions of disks
arranged side by side to provide the roll; and
FIG. 3 is a plan view of a half portion of the disk.
BEST MODE OF CARRYING OUT THE INVENTION
Embodiments of the invention will be described below with reference to the
drawings.
The shape detecting roll of the invention has basically the same
construction as the conventional one. The invention can be applied to
rolls of any construction insofar as the side surfaces of peripheral
portions of the adjacent disks form a clearance therebetween for
preventing the impairement of pressure detection accuracy due to the
interference between the peripheral portions. For example, the clearance
may have a length corresponding to the size of the pressure sensor
accommodating chamber (indicated at 14 in FIG. 3). Further the disk
peripheral portions (indicated at 10 in FIG. 2) may be outwardly tapered
so that the clearance is enlarged outward.
The material for the disks is not limited to SCM material but may be an
abrasion-resistant steel material containing one or at least two of Cr,
Si, Mo, V, Nb, Cu, Ni, W, Co, Ti, Zr, etc. in a total amount as large as
at least 7 wt. % which are reinforcing or hardening alloy elements. Given
below are composition (unit: wt. %) examples (1) to (3) of the material.
The steel material is disclosed in Unexamined Japanese Patent Application
SHO 59-179762.
______________________________________
(1) C: 0.75-1.75% Si: 0.5-3.0%
Mn: 0.1-2.0% Cr: 5.0-11.0%
Mo: 1.3-5.0% V: 0.1-5%
Balance: substantially Fe
______________________________________
(2) A composition corresponding to the composition (1) wherein the Fe is
partly replaced by one or at least two elements selected from the
following group to give improved strength and toughness.
______________________________________
REM: 0.001-0.5% Cu: 0.1-2.0%
Ni: 0.1-2.0% W: 0.1-2.0%
Co: 0.1-5.0% Nb: 0.01-3.0%
Ti: up to 2.0% Zr: up to 2.0%
______________________________________
(3) A composition corresponding to the composition (1) or (2) wherein the
Fe is partly replaced by one or at least two elements selected from the
following group to afford improved cuttability.
______________________________________
S: up to 0.20% Pb: up to 0.40%
Se: up to 0.30% Bi: up to 0.50%
Te: up to 0.30% Ca: 0.002-0.01%
______________________________________
To produce the shape detecting roll of the present invention, the disks are
prepared first by machining, subjected to heat treatments (usually,
hardening and tempering) as contemplated, then degreased with a solvent,
subjected to a reverse electrolytic treatment, thereafter pickled with an
acid or electrolytically degreased as usually practiced and then plated.
The term "reverse electrolytic treatment" refers to a treatment wherein
the workpiece to be plated (the disk in the case of the invention) is made
to serve as a positive electrode reverse to the polarity for
electroplating, and the surface of the workpiece is forcibly dissolved out
on decomposition by the passage of current. The plated disks are washed
with water and dried to obtain finished disks. As the plating treatment,
electroless Ni-P plating is usually conducted which affords excellent
adhesion to steel materials and produces plating films having a uniform
thickness, reduced in the number of pinholes and satisfactorily resistant
to corrosion. The plated disks are assembled together along with the other
parts, and the roll obtained has its peripheral surface polished.
If the reverse electrolytic treatment is conducted to excess, the disk
surface becomes markedly rough, so that it is necessary to suitably adjust
the concentration of the electrolytic bath, current passage time, voltage
and current. When a bath of 200 g/liter of chromic acid and 2 g/liter of
sulfuric acid in mixture is used, suitable treating conditions are, for
example, as follows.
______________________________________
Bath temperature: 50-80.degree. C.
Current: 530-700 A
Voltage: 10-17 V
Immersion time: 5-20 minutes
______________________________________
A specific production example is given below.
(1) An abrasion-resistant steel material having the composition listed in
Table 1 below was machined to prepare disk workpieces, which were then
heat-treated for hardening and tempering.
TABLE 1
______________________________________
C Si Mn Cr Mo V
______________________________________
1.25 1.7 1.0 8.0 3.0 2.5
______________________________________
(Note)
unit: wt. %,
balance: substantially Fe.
(2) The disk workpieces were attached to jigs and then degreased with
trichlene. The disk workpieces were suspended from the respective jigs,
one from each jig, so as to be freely movable.
(3) Using a mixture bath of 200 g/liter of chromic acid and 2 g/liter of
sulfuric acid, the workpieces were treated by reverse electrolysis under
the following conditions.
______________________________________
Bath temperature:
55.degree. C.
Immersion time:
12 min.
Current: 590 A Voltage: 10 V
______________________________________
(4) After the reverse electrolytic treatments, the following substrate
treatments were carried out in the order mentioned.
1. Dipping in hydrochloric acid, 2. washing with water, 3. electrolytic
degreasing, 4. washing with water, and 5. dipping in hydrochloric acid.
(5) Next, the disk workpieces were dipped in a chloride bath for an Ni
striking treatment and then subjected to an electroless Ni-P plating
treatment. For this plating treatment, air was injected into the plating
bath from the bottom for agitation and thereby expose every portion of the
disk workpieces to the plating bath uniformly and smoothly. The treatment
produced a plating with a thickness of 20 .mu.m (irregularities in
thickness: up to .+-.10%).
(6) The disks were washed with water, dried and then removed from the jigs.
The plating was then tested for peeling. Since the usual bend test can not
be conducted because of the great rigidiy of the substrate, the plating
was tested by placing the tip of screwdriver on the disk surface at an
angle of 30.degree. C. therewith and pushing the driver forward with the
greatest possible force while pressing the driver downward under the body
weight of the operator.
In a comparative example, disks were prepared in the same manner as above
employing an electroless Ni-P plating treatement except that the disk
workpieces were immersed in fresh bath of concentrated nitric acid instead
of the foregoing step (3). The plating was similarly tested for peeling.
Consequently, the plating film on the disk of the invention remained free
of peeling no matter how the plating was pushed and despite many
repetitions of the pushing stroke. On the other hand, the plating of the
comparative example peeled off relatively easily when subjected to the
pushing stoke several times although the workpiece was pickled with the
strong acid, i.e., fresh concentrated nitric acid.
(7) Pressure sensors were installed in the disks of the invention, which
were then arranged side by side with a seal ring interposed between the
adjacent disks and assembled into a roll with roll shafts attached to the
disk assembly. The surface of the roll was polished for finishing to
obtain a pressure detecting roll contemplated.
INDUSTRIAL APPLICABILITY
The shape detecting roll of the present invention is usable in metal
rolling processes.
Top